Wyniki wyszukiwania - Biblioteka Nauki

1

Comparative analysis of chosen field weakening methods for the space vector modulated - direct torque controlled drive system

100%

Nguyen Thac K. , Orłowska-Kowalska T.

Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały

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2011

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tom Vol. 65, nr 31

267-280

EN

This paper presents a new simple field weakening (FW) strategy for the Direct Torque Control (DTC) of the induction motor (IM). Based on the Space Vector Modulated - Direct Torque Control (SVM- DTC) scheme, an analysis and comparison of conventional (1/ωm) and proposed method are presented for a whole speed range including FW regions. The proposed strategy is verified through simulation with a 1.5 kW induction motor drive.

2

Control of the DTC-FSVM based induction motor drive in a wide speed range

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Nguyen Thac K. , Orlowska-Kowalska T.

Prace Naukowe Instytutu Maszyn, Napędów i Pomiarów Elektrycznych Politechniki Wrocławskiej. Studia i Materiały

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2014

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tom Vol. 70, nr 34

3--15

EN

In this paper the direct flux and torque control structure based on Flux-error Space Vector Modulation (DTC-FSVM) has been analyzed and compared to a classical DTC-SVM system. The control structures have been tested in a wide speed range including field weakening algorithm based on the voltage and current limits of the voltage inverter and the induction motor. The proposed control strategies are verified through simulation with a 3 kW induction motor drive.

3

Synchronous reluctance machine drive control with fast prototyping card implementation

100%

Burlikowski W. , Kielan P. , Kowalik Z.

Archives of Electrical Engineering

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2020

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tom Vol. 69, nr 4

757--769

EN

The Synchronous Reluctance Machine (SynRM) is an electrical machine in which the useful electromagnetic torque is produced due to rotor saliency. Its high powerand torque-to-mass ratio and very good efficiency make it a cheap and simple alternative for permanent magnet or induction motors, e.g. in electromobility applications. However, because of magnetic nonlinearities, the rotational speed and torque control of a SynRM is a nontrivial task. In the paper, a control algorithm based on a Hamiltonian mathematical model is presented. The model is formulated using measurement results, obtained by the drive controller. An algorithm is tested in the drive system consisting of a SynRM with the classical rotor and a fast prototyping card. The drive dynamic response in transient states is very good, but the proposed algorithm does not ensure the best efficiency after steady state angular velocity is achieved.

4

Assessment of direct torque control for induction motor drives

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Casadei D. , Serra G. , Tani A. , Zarri L.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2006

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tom Vol. 54, nr 3

237-254

EN

Among all control methods for induction motor drives, Direct Torque Control (DTC) seems to be particularly interesting being independent of machine rotor parameters and requiring no speed or position sensors. The DTC scheme is characterized by the absence of PI regulators, coordinate transformations, current regulators and PWM signals generators. In spite of its simplicity, DTC allows a good torque control in steady state and transient operating conditions to be obtained. However, the presence of hysteresis controllers for flux and torque could determine torque and current ripple and variable switching frequency operation for the voltage source inverter. This paper is aimed to analyze DTC principles, the strategies and the problems related to its implementation and the possible improvements.

5

Direct torque control of doubly fed induction machine

88%

Bonnet F. , Vidal P. E. , Pietrzak-David M.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2006

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tom Vol. 54, nr 3

307-314

EN

This paper presents novel biconverter structure to supply the Doubly Fed Induction Machine (DFIM). Two Voltage Source Inverters (VSI) feed the stator and rotor windings. The outputs of two VSI are combined electromechanically in the machine and, as a result, novel features can be obtained. For example, for high power drive applications, this configuration use two inverters dimensioned for a half of the OFIM power. A new Dual-Direct Torque Control scheme is developed with flux model of DFIM. Two Switching Tables (ST) linked to VSI are defined for stator and rotor flux vector control. Experimental and simulation results confirm good dynamic behaviour in the four quadrants of the speed-torque plane. Moreover, experimental results show the correct flux vector control behaviour and speed tracking performances.

6

Synchronous reluctance machine drive control with fast prototyping card implementation

88%

Burlikowski W. , Kielan P. , Kowalik Z. , Burlikowski W. , Kielan P. , Kowalik Z.

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nr 4

7

Improved direct torque control of induction motors using adaptive observer and sliding mode control

88%

Kouchih D. , Tadjine M. , Boucherit M. S.

Archives of Control Sciences

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2013

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tom Vol. 23, no. 3

361--376

EN

This paper presents the synthesis of an adaptive observer which is used for the improvement of the direct torque control of induction motor drives. The observer detects stator flux components in two-phase stationary reference frame, rotor speed and stator resistance by measure of the stator terminal voltages and currents. The observer is adapted using a simple algorithm which does not imply a high computational load. Stability analysis based on Lyapunov theory is performed in order to guarantee the closed loop stability. Simulation tests under load disturbance and stator resistance variation are provided to evaluate the consistency and performance of the proposed control technique in the low and high speeds.

8

DTC strategy for a DSP-based Five-Level Flying-Capacitor Drive with improved flux estimation

88%

Arasteh M. , Rahmati A. , Farhangi S. , Abrishamifar A.

Przegląd Elektrotechniczny

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2011

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tom R. 87, nr 6

132-139

EN

This paper gives a detailed analysis of direct torque control (DTC) strategy in a five-level drive and proposes a 24-sector switching table. Also, flux estimation has been improved by a discrete-time low-pass filter (LPF) with variable cut-off frequency. Algorithm to compensate the amplitude and phase errors is introduced and algorithm to determine digital filter coefficients at different speeds is presented. Simulation and practical results on a prototype using an induction motor 400V, 3kVA are given. To implement the DTC strategy, processor TMS320F2812 is used.

PL

Przedstawiono analizę strategii DTC w napędzie pięciopoziomowym i zaproponowano 24-sektorową tabelę przełączeń. Strumień był ulepszony dzięki zastosowaniu cyfrowego filtru dolnoprzepustowego o różnej częstotliwości odcięcia. Wprowadzono algorytm kompensacji błędu amplitudy i fazy dla różnych prędkości. Przeprowadzono symulację i badania prototypu dla silnika indukcyjnego 400 V, 3 kVA. Wykorzystano procesor TMS320F2812.

9

Backstepping/DTC control of a double star synchronous machine drive

88%

Boudana D. , Nezli L. , Tlemcani A. , Mahmoudi M. O. , Djemai M. , Tadjine M.

Archives of Control Sciences

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2010

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tom Vol. 20, no. 2

227-247

EN

Direct torque control (DTC) allows for very high quality torque control without a need for current controllers tuning or using coordinate transformation. However, barge torque ripples arise as well as inconstant inverter switching frequency due to the hysteresis of comparators. This paper present a backstepping/DTC control based on the space vector modulation (SVPWM) for double star synchronous machine (DSSM) to reduce the torque, flux, current and speed pulsations during steady state. By the coordinate transformation the DSSM models are presented in view of control. Then a conventional DTC is developed to get a decoupled system and a PI controller is designed to control the speed. To improve the static and dynamic control performance of the DSSM, the speed controller is designed using a backstepping/DTC procedure in conjunction with SVPWM. Simulation results with the conventional DTC and proposed backstepping/DTC are presented and compared. Results show the effectiveness and the robustness of the approach proposed.

10

W pełni bezczujnikowe sterowanie silnikiem indukcyjnym z wykorzystaniem metody Bezpośredniej Regulacji Momentu

88%

Grzesiak L. , Gąbka G.

Przegląd Elektrotechniczny

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2010

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tom R. 86, nr 4

273-279

PL

Artykuł opisuje sposób sterowania silnikiem indukcyjnym bez użycia jakichkolwiek sygnałów z silnika w postaci sprzężeń zwrotnych. Sygnały sterujące dla falownika wypracowywane są na podstawie modelu komputerowego układu. Zamodelowany układ zawiera implementację sterowania DTC oraz model matematyczny silnika indukcyjnego z falownikiem. W artykule zawarte zostały wyniki badań symulacyjnych oraz eksperymentalnych. Opisany został również wpływ momentu obciążenia na zachowanie układu.

EN

This article describes a kind of control of induction motor that do not use any signals from motor as a feedbacks. The control’s signals for inverter are provided by computer’s model of setup. This model includes DTC scheme and mathematical model of motor and inverter. This paper includes the results of computer’s simulations and experiments. Also describes the setup’s behavior under load.

11

Badania laboratoryjne maszyny dwustronnie zasilanej sterowanej według metody DTC

75%

Jeleń M. , Gierlotka K.

Prace Naukowe Politechniki Śląskiej. Elektryka

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2007

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tom z. 4

27-36

PL

W artykule omówiono zasady bezpośredniego sterowania momentu oraz mocy biernej (DTC) maszyny indukcyjnej dwustronnie zasilanej, zaprezentowano schemat układu sterowania, opisano budowę układu laboratoryjnego oraz przedstawiono wybrane wyniki badań laboratoryjnych.

EN

The principles of the direct control of the motor torque and reactive power in the double-fed induction machine stator circuit are described in the paper. The laboratory system and chosen results of experimental tests of the machine controlled according to the DTC method are presented.

12

Neuronowy regulator DTC dla silnika indukcyjnego

75%

Grzesiak L. M. , Gąbka G.

Przegląd Elektrotechniczny

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2010

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tom R. 86, nr 12

280-287

PL

Artykuł opisuje układ sterowania DTC dla silnika indukcyjnego, w którym tradycyjne regulatory zostały zastąpione regulatorem neuronowym. Opisano proces projektowania i uczenia sieci neuronowej. W artykule zawarte zostały wyniki badań symulacyjnych oraz badań eksperymentalnych.

EN

This article describes a DTC control strategy of induction motor. The traditional controllers have been replaced by neural controller. The way from initialization to learning neural network are described. This paper includes the test results of computer’s simulations and experiments.

13

Direct torque control of a doubly-fed induction generator connected to unbalanced grid

75%

Pura P. , Iwanski G.

Przegląd Elektrotechniczny

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2016

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tom R. 92, nr 5

40--44

EN

The paper presents a direct control of a DFIG electromagnetic torque and proposed scalar variable indirectly responsible for reactive component of instantaneous stator power. The principles of the control are presented and the simulation results of control method performance for balanced and unbalanced grid are given.

PL

Artykuł przedstawia algorytm sterowania maszyny dwustronnie zasilanej gdzie bezpośredniej kontroli podlega generowany moment elektromagnetyczny oraz zaproponowana zmienna skalarna, która pozwala na kontrolę chwilowej wartości generowanej mocy biernej. Przedstawiono zasadę działania metody sterowania oraz wyniki symulacyjne przy współpracy maszyny dwustronnie zasilanej z siecią symetryczną i asymetryczną.

14

An Investigation of Direct Torque Control and Hysteresis Current Vector Control for Motion Control Synchronous Reluctance Motor Applications

75%

Vajsz T. , Számel L. , Handler Á.

Power Electronics and Drives

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2019

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tom Vol. 4 (39)

115--124

EN

Synchronous reluctance motor drives are one of the most attractive alternatives of permanent magnet synchronous motor drives and induction motor drives in the field of conventional industrial and household applications. This tendency is expected to be continued in the case of motion control applications as well. This article investigates two torque-control algorithms that are possible candidates for motion control synchronous reluctance motor applications. The examined torque-control algorithms are direct torque control (DTC) and hysteresis current vector control (HCVC).

15

Direct torque control for induction machines using neural networks

75%

Messaif I. , Berkouk E.-M. , Saadia N.

Archives of Control Sciences

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2007

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tom Vol. 17, no. 1

93-104

EN

In this work, a novel switching vector selector in Direct Torque Control of an induction machine using Artificial Neural Network is studied. In the first part, we describe design of a speed sensor-less Direct Torque Control (DTC) strategy of an induction motor supplied by a two-level voltage source. For this, a conventional look up table is applied which improves the performances. Due to the high computation load, this technique is not convenient for an one-line and real-time control. Thus, a simplified method of choosing the output vector for two-level voltage source inverter-fed induction machine is proposed in the second part, and a novel switching vector selector using Artificial Neural Network (ANN) is trained under the tutor of the method mentioned above. The ANN receives attention as controllers for many industrial applications. Although these networks eliminate the need for mathematical models, they require a lot of training to understand the model of plant or process. In fact, when the stator flux and electromagnetic torque are different from theirs respective references, the output vector can be expediently acquired. Simulation results showed that the ANN structure can replace successfully the conventional look up table of the DTC.

16

Optymalizacja układów napędowych w oparciu o bezpośrednią kontrolę momentu

75%

Kiełbus Z. , Minksztym T.

Napędy i Sterowanie

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2002

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tom R. 4, nr 10

26--28

PL

Danfoss wprowadził na rynek przetwornicę częstotliwości VLT® 5000 Flux - dynamiczny sterowany wektorem strumienia pola napęd do wymagających zastosowań. Dzięki połączeniu sterowania wektorem strumienia z serwomotorami lub standardowymi silnikami AC otrzymujemy rozwiązanie napędu o niezwykle wysokich parametrach funkcjonalno-ekonomicznych. Na rynku urządzeń sterowania silnikami od lat znane są napędy sterowane wektorem strumienia pola. Oferując bardzo dużą dokładność i krótkie czasy odpowiedzi, nadają się one do wymagających aplikacji przemysłowych i nie tylko.

17

Maximum Torque Control of 3-phase induction motor drives

75%

Wach P.

Archives of Electrical Engineering

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2018

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tom Vol. 67, nr 2

433–-445

EN

Maximum Torque Control (MTC) is a new method applied for control of induction motor drives. The drive is controlled by dc voltage supplying a converter in the range below nominal speed and by a field that weakens for a speed range above the nominal speed. As a consequence, the control is quite similar to the control of a classical separately excited dc motor. This control method could be explained as a kind of simplification of Direct Torque Control (DTC), because the switching scheme is the same as for the DTC, but the variable responsible for a torque control is constantly set for “torque increase”. This kind of control of induction motor drive is simpler than DTC because torque values need not be estimated. The proposed control method offers very good performance for 3-phase induction motors and requires smaller switching frequency in comparison to DTC and Field Oriented Control (FOC). The application of the control is widely demonstrated for a 3-phase 315 kW, 6 kV motor drive by use of computer simulation.

18

Bearing current reduction in a five level flying capacitor DTC drive

75%

Aresteh M. , Rahmati A. , Farhangi S. , Abrishamifar A.

Przegląd Elektrotechniczny

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2011

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tom R. 87, nr 4

286-292

EN

Bearing currents in induction motors caused by breakdown of thin layers of grease (electrical discharge machining) known as the main factor in bearing damage and is a function of common mode voltage (CMV). In this paper various switching tables to reduce CMV and thus bearing currents in a DTC-controlled five-level drive are compared and a new switching table using redundancy concept is presented which efficiently reduces the CMV. The simulation results in SIMULINK/Matlab environment prove the capability of the proposed strategy for reducing the common mode voltage in a five level inverter. The experimental results of a prototype five level flying capacitor inverter confirm common mode reduction using the proposed switching table.

PL

Prądy łożyskowania w silniku indukcyjnym powodowane przebiciem w cienkiej warstwie smaru są jedną z głównych przyczyn uszkodzenia łożysk i jest funkcją składowej wspólnej napięcia CMV. W artykule zaprezentowano tabele przełączeń umożliwiającą redukcję CMV w sterowniku bezpośredniej kontroli momentu DTC. Wyniki symulacji i eksperymentów potwierdziły możliwość redukcji CMW w pięciopoziomowym przekształtniku.

19

Enhanced direct torque control of a Syn-Rm, using adaptive flux observer, including magnetic saturation and iron losses

75%

Boussouar M. E. , Yahia K. , Cardoso A. J. M. , Sahraoui M.

Przegląd Elektrotechniczny

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2023

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tom R. 99, nr 4

255--261

EN

An enhanced direct torque control (E-DTC) system of a synchronous reluctance motor (Syn-RM) is presented in this paper. The motor system is modelled by taking into account its non-linear behaviours such as iron losses and magnetic saturation. The proposed method consists of incorporating hysteresis DTC with a model reference adaptive system (MRAS) flux observer. This technique is applied in order to achieve good torque and flux ripples reduction, which ensure a smooth operation of the Syn-RM along all the speed range. Furthermore, the proposed method has simple design and implementation in the overall control system, and can avoid the drawbacks of conventional flux estimators. Simulation results show the effectiveness of the proposed method.

PL

W artykule przedstawiono udoskonalony układ bezpośredniego sterowania momentem obrotowym (E-DTC) synchronicznego silnika reluktancyjnego (Syn-RM). Układ ruchu jest modelowany z uwzględnieniem jego nieliniowych zachowań, takich jak straty żelaza i nasycenie magnetyczne. Proponowana metoda polega na włączeniu histerezy DTC do wzorcowego obserwatora strumienia adaptacyjnego systemu odniesienia (MRAS). Technika ta jest stosowana w celu uzyskania dobrego momentu obrotowego i redukcji tętnień strumienia, które zapewniają płynną pracę Syn-RM w całym zakresie prędkości. Ponadto, zaproponowany sposób ma prostą konstrukcję i implementację w całym systemie sterowania i pozwala uniknąć wad konwencjonalnych estymatorów strumienia. Wyniki symulacji pokazują skuteczność proponowanej metody.

20

Direct torque control of an induction motor using the fuzzy controller

75%

Olesiak K.

Przegląd Elektrotechniczny

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2015

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tom R. 91, nr 12

179-181

EN

The paper presents a drive model with an induction motor fed by DTC converter. The application of the rotational speed fuzzy controller in the control system drive was proposed. The general rule base and the tuning procedure for the Mamdani fuzzy controller was presented. The simulation tests of the drive model were carried out during start-up, braking and reverse. The results of simulation tests are presented as time characteristics of the stator current, the rotor speed, the electromagnetic torque and the reference torque.

PL

W artykule przedstawiono model napędu z silnikiem indukcyjnym zasilanym przez przekształtnik DTC. W układzie sterowania napędu zaproponowano zastosowanie regulatora rozmytego prędkości obrotowej. Przedstawiono ogólną formułę bazy reguł oraz procedurę strojenia dla regulatora rozmytego typu Mamdaniego. Przeprowadzono badania symulacyjne modelu napędu podczas rozruchu, hamowania oraz rewersu. Rezultaty badań zaprezentowano w postaci przebiegów czasowych prądu stojana, prędkości wirnika, momentu elektromagnetycznego oraz momentu odniesienia.